Rename get_migrate method for consistency

Use get_migration instead.

Change-Id: I921ec986297771a908700b3ed3f7fc449f897087

cloudkitty/billing/hash/db/api.py

@@ -95,7 +95,7 @@ class HashMap(object):
     """Base class for hashmap configuration."""
 
     @abc.abstractmethod
-    def get_migrate(self):
+    def get_migration(self):
         """Return a migrate manager.
 
         """

cloudkitty/billing/hash/db/sqlalchemy/api.py

@@ -35,7 +35,7 @@ def get_backend():
 
 class HashMap(api.HashMap):
 
-    def get_migrate(self):
+    def get_migration(self):
         return migration
 
     def get_service(self, service):

cloudkitty/cli/dbsync.py

@@ -60,7 +60,7 @@ class DBCommand(object):
         else:
             try:
                 module = self.billing_models[name]
-                mod_migration = module.get_migrate()
+                mod_migration = module.get_migration()
             except IndexError:
                 raise ModuleNotFound(name)
         return mod_migration
@@ -70,7 +70,7 @@ class DBCommand(object):
             migrations = []
             migrations.append(self.get_module_migration('cloudkitty'))
             for model in self.billing_models.values():
-                migrations.append(model.get_migrate())
+                migrations.append(model.get_migration())
         else:
             return [self.get_module_migration(name)]
         return migrations